Sorry for the resend (if you got this twice)...
--------------------
Hi, all. Could somebody help me out here? I'm pulling my hair out on
this one...
After finding my device, claiming the interface, grabbing an endpoint, and
opening a pipe, I try to send 30 bytes down the pipe (see JUnit test below).
The output says:
device = PowerShot G2
Sending 30 bytes
return code (expected=30,actual=0)
I expect to see 30 bytes transferred, but I see 0.
There are no exceptions thrown. For grins, I tried the other two endpoints,
but they both block forever.
My real question is: Why would I get a "successful" completion (no
exceptions) but get zero bytes transferred? Am I doing something wrong
here?
Thanks,
--dave;
===========================================================
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import javax.usb.UsbConfiguration;
import javax.usb.UsbDevice;
import javax.usb.UsbEndpoint;
import javax.usb.UsbHostManager;
import javax.usb.UsbHub;
import javax.usb.UsbInterface;
import javax.usb.UsbPipe;
import junit.framework.TestCase;
public class SendToUsbDeviceTest extends TestCase {
UsbDevice device;
public void testSend() throws Exception {
List<UsbDevice> devices =
findAddressableDevices(UsbHostManager.getUsbServices().getRootUsbHub());
Iterator it = devices.iterator();
while (it.hasNext()) {
// find my camera
if ((device =
(UsbDevice)it.next()).getProductString().contains("G2"))
break;
}
System.out.println("device = " + device.getProductString());
UsbConfiguration config = device.getActiveUsbConfiguration();
UsbInterface intf = config.getUsbInterface((byte)0);
intf.claim();
UsbEndpoint endp = intf.getUsbEndpoint((byte)0x83);
UsbPipe pipe = endp.getUsbPipe();
pipe.open();
byte[] data = new byte[] {
(byte) 0x10, (byte) 0x01, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00 };
System.out.println("Sending 30 bytes");
int returnCode = pipe.syncSubmit(data);
System.out.println("return code (expected=30,actual=" +
returnCode + ")");
assertEquals("check return code from syncSubmit", 30, returnCode);
}
public List<UsbDevice> findAddressableDevices(UsbDevice parent) {
List<UsbDevice> devices = new ArrayList<UsbDevice>();
if (parent.isUsbHub()) {
List children = ((UsbHub) parent).getAttachedUsbDevices();
Iterator it = children.iterator();
while (it.hasNext()) {
UsbDevice child = (UsbDevice) it.next();
List<UsbDevice> childsDevices =
findAddressableDevices(child);
Iterator childIterator = childsDevices.iterator();
while (childIterator.hasNext()) {
UsbDevice d = (UsbDevice) childIterator.next();
if (!d.isUsbHub())
devices.add(d);
}
}
} else {
devices.add(parent);
}
return Collections.unmodifiableList(devices);
}
}
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